2004 CADILLAC CTS V wheel size

Notice:If your vehicle has P245/45R18 size
tires, they are classied as low-prole tires.
Low-prole tires are more susceptible to damage
from road hazards or curb impact than standard
prole tires. Tire and or wheel assembly damage can
occur when coming into contact with road hazards
like, potholes or sharp edged objects or when
sliding into a curb. Your GM warranty does not
cover this type of damage. Keep tires set to
the correct ination pressure and, when possible
avoid contact with curbs, potholes and other
road hazards.Winter Tires
If you expect to drive on snow or ice covered roads
often, you may want to get winter tires for your vehicle.
All season tires provide good overall performance on
most surfaces but they may not offer the traction
you would like or the same level of performance as
winter tires on snow or ice covered roads.
See your dealer for details regarding winter tire
availability and proper tire selection. Also, seeBuying
New Tires on page 5-74
If you choose to use snow tires:
Use tires of the same brand and tread type on
all four wheel positions.
Use only radial ply tires of the same size,
load range, and speed rating as the original
equipment tires.
Winter tires with the same speed rating as your original
equipment tires may not be available for H, V, W
and ZR speed rated tires. If you choose snow tires with
a lower speed rating, never exceed the tire’s maximum
speed capability.
5-59

Tire Size
The following illustration shows an example of a typical
passenger car tire size.
(A) P-Metric Tire:The United States version of a
metric tire sizing system. The letter “P” as the
rst character in the tire size means a passenger
vehicle tire engineered to standards set by the
U. S. Tire and Rim Association.
(B) Tire Width:The three-digit number indicates the
tire section width in millimeters from sidewall to sidewall.(C) Aspect Ratio:A two-digit number that indicates
the tire height-to-width measurements. For example,
if the tire size aspect ratio is “70,” as shown in item “C”
of the illustration, it would mean that the tire’s sidewall
is 70% as high as it is wide.
(D) Construction Code:A letter code is used to
indicate the type of ply construction in the tire.
The letter “R” means radial ply construction;
the letter “D” means diagonal or bias ply construction;
and the letter “B” means belted-bias ply construction.
(E) Rim Diameter:Diameter of the wheel in inches.
(F) Service Description:These characters represent
the load range and speed rating of the tire. The load
index represents the load carry capacity a tire is certied
to carry. The load index can range from 1 to 279.
The speed rating is the maximum speed a tire is certied
to carry a load. Speed ratings range from “A” to “Z”.
5-62

The Tire and Loading Information label (tire information
placard) is attached, to either, the center pillar near the
driver’s door latch post or on the rear edge of the driver’s
side rear passenger door. The label shows the size of
your vehicle’s original tires and the correct ination
pressure for your vehicle’s tires when they are cold.
SeeInation - Tire Pressure on page 5-67andLoading
Your Vehicle on page 4-34for additional information.
Your vehicle’s TPM system can alert you about a low tire
pressure condition but it does not replace normal tire
maintenance. SeeTire Inspection and Rotation on
page 5-72andTires on page 5-58.
Each TPM sensor has a unique identication code that
is matched to one of the four tire positions on your
vehicle. Any time you rotate your vehicle’s tires
or replace one or more TPM sensors, the identication
codes will need to be matched to the new tire and
wheel position. The TPM matching process is performed
in a specic sequence and time limit. See your dealer
for service.Notice:Do not use a tire sealant if your vehicle
is equipped with Tire Pressure Monitors.
The liquid sealant can damage the tire pressure
monitor sensors.
The TPM system operates on a radio frequency subject
to Federal Communications Commission (FCC) Rules
and with Industry and Science Canada.
This device complies with Part 15 of the FCC Rules
and with RSS-210 of Industry and Science Canada.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received
including interference that may cause undesired
operation of the device.
Changes or modications to this system by other than
an authorized service facility could void authorization to
use this equipment.
5-71

Make certain that all wheel nuts are properly tightened.
See “Wheel Nut Torque” underCapacities and
Specications on page 5-111.
{CAUTION:
Rust or dirt on a wheel, or on the parts to
which it is fastened, can make wheel nuts
become loose after a time. The wheel could
come off and cause an accident. When you
change a wheel, remove any rust or dirt from
places where the wheel attaches to the vehicle.
In an emergency, you can use a cloth or a
paper towel to do this; but be sure to use a
scraper or wire brush later, if you need to,
to get all the rust or dirt off. SeeChanging a
Flat Tire on page 5-81.
When It Is Time for New Tires
One way to tell when it’s
time for new tires is to
check the treadwear
indicators, which will
appear when your tires
have only 1/16 inch
(1.6 mm) or less of
tread remaining.
You need a new tire if any of the following statements
are true:
You can see the indicators at three or more places
around the tire.
You can see cord or fabric showing through the
tire’s rubber.
The tread or sidewall is cracked, cut or snagged
deep enough to show cord or fabric.
The tire has a bump, bulge or split.
The tire has a puncture, cut or other damage that
can’t be repaired well because of the size or
location of the damage.
5-73

{CAUTION:
Mixing tires could cause you to lose control
while driving. If you mix tires of different sizes
or types (radial and bias-belted tires), the
vehicle may not handle properly, and you could
have a crash. Using tires of different sizes may
also cause damage to your vehicle. Be sure to
use the same size and type tires on all wheels.
It’s all right to drive with your compact spare
temporarily, it was developed for use on your
vehicle. SeeCompact Spare Tire on page 5-91.
{CAUTION:
If you use bias-ply tires on your vehicle, the
wheel rim anges could develop cracks after
many miles of driving. A tire and/or wheel
could fail suddenly, causing a crash. Use only
radial-ply tires with the wheels on your vehicle.
Uniform Tire Quality Grading
Quality grades can be found where applicable on the
tire sidewall between tread shoulder and maximum
section width. For example:
Treadwear 200 Traction AA Temperature A
The following information relates to the system
developed by the United States National Highway
Traffic Safety Administration, which grades tires by
treadwear, traction and temperature performance.
(This applies only to vehicles sold in the United States.)
The grades are molded on the sidewalls of most
passenger car tires. The Uniform Tire Quality Grading
system does not apply to deep tread, winter-type
snow tires, space-saver or temporary use spare tires,
tires with nominal rim diameters of 10 to 12 inches
(25 to 30 cm), or to some limited-production tires.
While the tires available on General Motors passenger
cars and light trucks may vary with respect to these
grades, they must also conform to federal safety
requirements and additional General Motors Tire
Performance Criteria (TPC) standards.
5-75

Used Replacement Wheels
{CAUTION:
Putting a used wheel on your vehicle is
dangerous. You can’t know how it’s been used
or how far it’s been driven. It could fail suddenly
and cause a crash. If you have to replace a
wheel, use a new GM original equipment wheel.
Tire Chains
{CAUTION:
Don’t use tire chains. There’s not enough
clearance. Tire chains used on a vehicle without
the proper amount of clearance can cause
damage to the brakes, suspension or other
vehicle parts. The area damaged by the tire
chains could cause you to lose control of your
vehicle and you or others may be injured in a
crash. Use another type of traction device only
if its manufacturer recommends it for use on
your vehicle and tire size combination and
road conditions. Follow that manufacturer’s
instructions. To help avoid damage to your
vehicle, drive slowly, readjust or remove the
device if it’s contacting your vehicle, and don’t
spin your wheels. If you do nd traction devices
that will t, install them on the rear tires.
5-78

A. Compact Spare
Tire Cover
Wing Nut
B. Compact Spare
Tire Cover
C. Plastic Wing Nut
D. Retainer
E. Jack Container
with Wheel Wrench
and JackF. Flat Road Tire
G. Compact
Spare Tire
H. Foam Insert
I. Bolt
J. Wheel Wrench
K. Jack
L. Jack Container
Compact Spare Tire
Although the compact spare tire was fully inated
when your vehicle was new, it can lose air after
a time. Check the ination pressure regularly.
It should be 60 psi (420 kPa).
After installing the compact spare on your vehicle,
you should stop as soon as possible and make sure
your spare tire is correctly inated. The compact spare
is made to perform well at speeds up to 65 mph
(105 km/h) for distances up to 3,000 miles (5 000 km),
so you can nish your trip and have your full-size
tire repaired or replaced where you want. Of course,
it’s best to replace your spare with a full-size tire as soon
as you can. Your spare will last longer and be in good
shape in case you need it again.
Notice:When the compact spare is installed, do not
take your vehicle through an automatic car wash
with guide rails. The compact spare can get caught
on the rails. That can damage the tire and wheel, and
maybe other parts of your vehicle.
Don’t use your compact spare on other vehicles.
And don’t mix your compact spare tire or wheel with
other wheels or tires. They won’t t. Keep your spare tire
and its wheel together.
Notice:Tire chains will not t your compact spare.
Using them can damage your vehicle and can
damage the chains too. Do not use tire chains on
your compact spare.
5-91

Tire Sidewall Labeling......................................5-60
Tire Size.......................................................5-62
Tire Terminology and Denitions........................5-63
Tires.............................................................5-58
Buying New Tires........................................5-74
Chains.......................................................5-78
Changing a Flat Tire....................................5-81
Compact Spare Tire.....................................5-91
If a Tire Goes Flat.......................................5-79
Ination - Tire Pressure................................5-67
Inspection and Rotation................................5-72
Pressure Monitor System..............................5-70
Run-Flat.....................................................5-66
Uniform Tire Quality Grading.........................5-75
Wheel Alignment and Tire Balance.................5-77
Wheel Replacement.....................................5-77
When It Is Time for New Tires......................5-73
To Use the Engine Coolant Heater....................2-26
Top Speed – Fuel Cut Off................................3-86
Top Strap......................................................1-39
Top Strap Anchor Location...............................1-40
Torque Lock (Automatic Transmission)...............2-38
Total Weight on Your Vehicle’s Tires..................4-41
Towing
Recreational Vehicle.....................................4-33
Towing a Trailer..........................................4-39
Your Vehicle...............................................4-32Traction
Control System (TCS).............................4-8, 4-9
Control System Warning Light.......................3-45
Limited-Slip Rear Axle..................................4-11
Stabilitrak
®System......................................4-11
Traction Engaged............................................3-87
Trailer Brakes.................................................4-42
Trans (Transmission) Hot – Idle Engine..............3-87
Transmission
Fluid, Automatic...........................................5-25
Fluid Hot Message......................................3-57
Fluid, Manual..............................................5-27
Transmission Operation, Automatic....................2-26
Transmission Operation, Manual........................2-33
Transmission, Transaxle, Transfer Case Unit
Repair Manual............................................7-11
Transportation Options...................................... 7-8
Trip Odometers..............................................3-40
Trunk............................................................2-12
Trunk Lock Release........................................2-12
Trunk Open...................................................3-87
Turn and Lane-Change Signals.........................3-10
Turn Signal On...............................................3-88
Turn Signal/Multifunction Lever..........................3-10
Turn Signals When Towing a Trailer..................4-44
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